Two forces F1 and F2 are acting on a mass M=4kg. The force F1 = 7i + 6j + 8k, in N. The acceleration of the mass is given by a = 1i + 3j + 2k, in m/s2. Calculate the magnitude of F2 .
The Attempt at a Solution
F1=sqrt(7^2+6^2+8^2) = 12.2066N
a=sqrt(1^2+3^2+2^2) = 3.71466m/s
plug it all in and I get F2=2.7601N
I have no idea what I'm doing wrong, so if some one would point me in the right direction, that would be great.